Description:
------------
Here is a GDB backtrace of what i get when i try to query my solr :

Program received signal SIGSEGV, Segmentation fault.
0x00533cb0 in solr_encode_string () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
(gdb) bt
#0  0x00533cb0 in solr_encode_string () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
#1  0x005330e8 in solr_encode_document () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
#2  0x005339a2 in solr_encode_result () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
#3  0x00533ed7 in solr_encode_object () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
#4  0x0053400c in solr_encode_generic_xml_response () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
#5  0x0052ec5f in zim_SolrResponse_getResponse () from /usr/local/lib/php/extensions/debug-zts-20090626/solr.so
#6  0x0855e627 in zend_do_fcall_common_helper_SPEC (execute_data=0x8c942e4, tsrm_ls=0x8aab070)
    at /home/charronp/php-dev/branches/PHP_5_3/Zend/zend_vm_execute.h:313
#7  0x0855ee92 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x8c942e4, tsrm_ls=0x8aab070)
    at /home/charronp/php-dev/branches/PHP_5_3/Zend/zend_vm_execute.h:418
#8  0x0855d8f7 in execute (op_array=0x8c6691c, tsrm_ls=0x8aab070) at /home/charronp/php-dev/branches/PHP_5_3/Zend/zend_vm_execute.h:104
#9  0x0852be8a in zend_execute_scripts (type=8, tsrm_ls=0x8aab070, retval=0x0, file_count=3) at /home/charronp/php-dev/branches/PHP_5_3/Zend/zend.c:1194
#10 0x084a72a0 in php_execute_script (primary_file=0xbffff2d0, tsrm_ls=0x8aab070) at /home/charronp/php-dev/branches/PHP_5_3/main/main.c:2231
#11 0x08601d25 in main (argc=3, argv=0xbffff464) at /home/charronp/php-dev/branches/PHP_5_3/sapi/cli/php_cli.c:1190


Reproduce code:
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<?php
ini_set('display_errors','1');
define('SOLR_SERVER_HOSTNAME', 'solr');
define('SOLR_SECURE', false);
define('SOLR_SERVER_PORT', ((SOLR_SECURE) ? 8443 : 8983));
define('SOLR_SERVER_TIMEOUT', 10);
$options = array(
        'hostname' => SOLR_SERVER_HOSTNAME,
        'port'     => SOLR_SERVER_PORT,
        'secure'   => SOLR_SECURE,
        'timeout'  => SOLR_SERVER_TIMEOUT,
        'path'     => '/solr/mycore'
        );
$client = new SolrClient($options);
$query = new SolrQuery('id:1');

$updateResponse = $client->query($query);
$response_array = $updateResponse->getResponse();
?>

And here is the received XML :

<?xml version="1.0" encoding="UTF-8"?>
<response>

<lst name="responseHeader">
 <int name="status">0</int>
 <int name="QTime">0</int>
 <lst name="params">
  <str name="indent">on</str>
  <str name="q">id:1 AND type:collection</str>
  <str name="wt">xml</str>
  <str name="version">2.2</str>
 </lst>
</lst>
<result name="response" numFound="1" start="0">
 <doc>
  <str name="body"/>
  <str name="classNameLabel">_LBL_COLLECTION</str>
  <str name="controllerName">collection</str>
  <str name="description"/>
  <str name="id">1</str>
  <str name="searchTitle">Accueil</str>
  <arr name="text"><str>1</str><str>collection</str><str>Accueil</str>
	<str/><str/></arr>
  <str name="title">Accueil</str>
  <str name="type">collection</str>
  <str name="uniqId">collection_1</str>
  <str name="url">/accueil</str>
 </doc>
</result>
</response>


Expected result:
----------------
No segfault

Actual result:
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Segfault